I have an issue where my date columns are transforming to numbers and defined as 'general' when I refresh the data. I've tried formatting the entire column as date and saving the file. The next time I open the report and refresh the dates are converted to it's numerical equivalent. In Power Query, the columns are seen as Date/Time; therefore, I changed it to 'Date' to see if the Time portion could be causing a problem. That did not help. I'm at a loss as to what the issue is. This does not happen with Excel 2013. I can't find any settings in Excel 365 that might be causing this.